A 220 volt, 1000 watt bulb is connected across a 110 volt mains supply. The power consumed will  be

A piece of copper and another of germanium are cooled from room temperature to 80K.The resistance of

A 5⁰C rise in temperature is observed in a conductor by passing a current. When the current is doubled the rise in temperature will be approximately :

The velocity of charge carriers of current(about 1A) in a metal under normal conditions is of the order of 

The temperature of inversion of a thermocouple is 620⁰ C and the neutral temperature is 300⁰CWhat is the temperature of cold junction?

In a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should

A battery is used to charge a parallel plate capacitor till the potential difference between the plates becomes equal to the electromotive force of the battery. The ratio of the energy stored in the capacitor and the work done by the battery will be

Fuse wire is a wire of 

The negative Zn pole of a Daniell cell, sending a contant current through a circuit, decreases in mass by 0.13 g in 30 minutes. If the electrochemical equivalent of Zn and Cu are 32.5 and 31.5 respectively, the increase in the mass of the positive Cu pole in this time is

A condenser having a capacity of 2 μF is charged to 200 V and then the plates of the capacitor are connected to a resistance wire.The heat produced is